It's missing on the X75 as well. BRING IT BACK. I will be switching from Deco completely if you cannot add this basic functionality back to my routers. I want to easily test what speed my ISP is...

Bring it back!!!!! I would NOT have continued with Deco if I knew that you were discontinuing this key feature.

@Johje Range extenders are rarely a good idea - they significantly cut your speed/bandwidth. Avoid them like the plague. Add another M9 Plus (or Deco of your choice) to extend your mesh. 15m is not...